新型基片集成波导带通滤波器的研究

发布时间：2018-05-27 06:11

本文选题：基片集成波导(SIW) + 交叉耦合　；参考：《中国矿业大学》2017年硕士论文

【摘要】：基片集成波导(Substrate Integrated Waveguide,SIW)是一种新型的导波结构,它结合了波导和微带结构的各自优点,具有制造成本低、传输损耗小、功率容量大和易于与其它平面结构集成等优点。本文首先对微波滤波器的相关理论知识及其设计方法进行分析研究,介绍了交叉耦合滤波器的综合方法,接着由传统矩形波导引入SIW谐振腔,包括SIW的传输特性、腔体之间的耦合方式以及滤波器端口馈电方式。主要研究内容如下:1)利用四分之一模SIW设计了刻蚀椭圆缺陷的四分之一模交叉耦合带通滤波器,由于四分之一模技术的应用以及椭圆缺陷结构的引入,使得滤波器的尺寸减小了88%,并且在上阻带产生一个传输零点(Transmission zero,TZ),大大地改善了选择特性。2)提出了一种刻蚀π形槽线的感性窗结构,并将其应用在圆形SIW谐振腔中。该结构不仅增强了两腔体之间的耦合强度而且保证了圆形SIW谐振腔的完整性。同时,S形槽线作为电耦合结构首次应用于圆形SIW滤波器中。综合以上两种新型结构,设计了三腔体圆形SIW交叉耦合带通滤波器,在下阻带出现一个TZ,然后又设计了四腔体圆形SIW交叉耦合带通滤波器,在其上下阻带分别产生一个TZ,TZ处的衰减均达到-40d B以下,极大地改善了滤波器的频率选择性能。3)对微带贴片和SIW双模结构进行分析,提出了一种新型SIW双层双模谐振腔。该结构是结合了微带贴片和SIW结构的双模结构,比传统的SIW结构减小了50%以上。
[Abstract]:Substrate Integrated Waveguide (SIW) is a new type of guided wave structure. It combines the advantages of the waveguide and microstrip structure. It has the advantages of low manufacturing cost, small transmission loss, high power capacity and easy to integrate with other planar structures. The method is analyzed and studied. The synthesis method of cross coupling filter is introduced. Then the SIW resonator is introduced into the traditional rectangular waveguide, including the transmission characteristics of SIW, the coupling mode between the cavities and the feed mode of the filter port. The main contents are as follows: 1) the 1/4 mode intersection of the etching ellipse defect is designed by using the 1/4 mode SIW. Due to the application of 1/4 mode technology and the introduction of the elliptical defect structure, the size of the filter is reduced by 88%, and a transmission zero point (Transmission zero, TZ) is produced in the upper stopband, and the selection characteristic.2 is greatly improved. In a circular SIW resonator, the structure not only enhances the coupling strength between the two cavities, but also ensures the integrity of the circular SIW resonator. At the same time, the S shaped slot line is applied to the circular SIW filter as an electric coupling structure for the first time. The three cavity circular SIW cross coupling bandpass filters are designed for the above two new structures. We present a TZ, and then design a four cavity round SIW cross coupling bandpass filter, which produces a TZ in its upper and lower hindrance. The attenuation at TZ is all below -40d B. The frequency selection performance of the filter is greatly improved. The structure of the microstrip patch and SIW double mode is analyzed, and a new type of SIW double mode double mode resonator is proposed. The structure is a dual mode structure which combines microstrip patch and SIW structure, which is reduced by more than 50% over the traditional SIW structure.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN713

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